package com.rceeslca.common.utils;

import cn.hutool.core.util.StrUtil;
import org.springframework.http.HttpHeaders;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

/**
 * HttpContext工具栏
 * @author rceeslca
 */
public class HttpContextUtils {


    public static HttpServletRequest getHttpServletRequest(){
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        if(requestAttributes==null){
            return null;
        }

        return ((ServletRequestAttributes)requestAttributes).getRequest();
    }


    public static Map<String,String> getParameterMap(HttpServletRequest request){
        Enumeration<String> parameters = request.getParameterNames();
        Map<String,String> params = new HashMap<>();
        while (parameters.hasMoreElements()) {
            String parameter = parameters.nextElement();
            String value = request.getParameter(parameter);
            if (StrUtil.isNotBlank(value)) {
                params.put(parameter,value);
            }
        }

        return params;
    }


    public static String getDomain(){
        HttpServletRequest request = getHttpServletRequest();
        StringBuffer url = request.getRequestURL();
        return url.delete(url.length()-request.getRequestURI().length(),url.length()).toString();
    }


    public static String getOrigin(){
        HttpServletRequest request = getHttpServletRequest();
        return request.getHeader(HttpHeaders.ORIGIN);
    }

}
